Vulnerability · CVE-2026-114607

Better Auth is an authentication and authorization library for TypeScript.

Q: Which versions are affected?

Compare what you have installed with >= 1.4.0-beta.18, < 1.7.7. Compare the installed version with the linked vendor advisory before you change production.

Q: What should an analyst verify?

CWE-287: Improper Authentication. EPSS 0.42%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Published Oct 22, 2026 · catalog updated Oct 27, 2026 · Better Auth is an

Last checked Nov 3, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-114607. EPSS is 0.42%. Act only if a listed version of Better Auth is an is installed.

Gaps on this record

The stored product name is a package slug. The name on this page is taken from the title (Better Auth is an).
No vendor fix or required action is stored. Compare the linked advisory before you change production.

Severity: Critical9.1
Known exploitation: Not in CISA/VulnCheck KEV
EPSS: 0.42%
Remediation: Version ranges on file
Affected products: npm better-auth · package npm · vendor better-auth

## Am I affected? You may be affected if you use from through versions before with the Magic Link plugin and social or Generic OAuth sign-in. You are affected if **all** of these are true: - Magic Link is enabled with default , or with and global (including a hashed default). - At least one built-in social provider or Generic OAuth provider is enabled. - OAuth state uses , the default when a database or secondary storage is configured. Cookie-backed state blocks this path, subject to the OAuth Proxy condition below. With custom hashers, confirm the flows cannot resolve to the same stored identifier. ## Summary Better Auth accepts an OAuth sign-in state value as a Magic Link token. An attacker can start an OAuth sign-in with any email address and use the returned state value to finish a Magic Link sign-in for that address. They never prove that they can read that email. ## Impact An unauthenticated attacker who knows a user's email address can get a normal session for that user, with all of that account's permissions. They need no access to the mailbox, and they do not need to sign in with the OAuth provider or complete an OAuth callback. If Magic Link sign-up is enabled and no user has the email address, the attacker can instead create an account that Better Auth wrongly marks as email verified, and is signed in to it. The false verified-email flag can also bypass Better Auth's default unproven-account protections when the mailbox owner later signs in, leaving the attacker's session in that account. Applications that trust verified email addresses or email domains may give this account more access, depending on the application. ## Patches The fix is merged for the planned 1.7.7 release. That package is not available yet. Upgrade and installed Better Auth adapters, plugins, and integrations released alongside it together. Upgrade servers sharing verification storage in the same cutover. Request new Magic Links and restart pending OAuth or SAML sign-ins; links and sta

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

npm better-auth>= 1.4.0-beta.18, < 1.7.7
package npmversion unspecified
vendor better-authversion unspecified

How to fix CVE-2026-114607

Upgrade
CVE-2026-114607 lists a fix boundary at 1.7.7. Compare the installed build with that boundary before you change production.
Version check
Affected < 1.7.7
Advisory
Open the cve_org record and follow its fix.
Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-114607. EPSS is 0.42%. Act only if a listed version of Better Auth is an is installed.

Which versions are affected?

Compare what you have installed with >= 1.4.0-beta.18, < 1.7.7. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-287: Improper Authentication. EPSS 0.42%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

Oct 22, 2026 · EUVD
Detected
Better Auth is an authentication and authorization library for TypeScript. From 1.4.0-beta.18 until 1.7.7, deployments that enable Magic Link with storeToken set to plain, or with storeToken set to hashed and the global verification.storeIdentifier setting also set to hashed, enable a built-in social or Generic OAuth provider, and use account.storeStateStrategy set to database can accept an OAuth
Oct 27, 2026 · GitHub Advisory Database
Updated
## Am I affected? You may be affected if you use from through versions before with the Magic Link plugin and social or Generic OAuth sign-in. You are affected if **all** of these are true: - Magic Link is enabled with default , or with and global (including a hashed default). - At least one built-in social provider or Generic OAuth provider is enabled. - OAuth state uses , the default when a datab

Sources

CVE.orgVulnerability recordCVE-2026-114607
Official CVE identifier
cve.org
FIRST EPSSExploitation probabilityCVE-2026-114607
30-day exploitation probability 0.42%
first.org
EUVDVulnerability recordEUVD-2026-108256
Better Auth is an authentication and authorization library for TypeScript. From 1.4.0-beta.18 until 1.7.7, deployments that enable Magic Link with storeToken set to plain, or with storeToken set to hashed and the global verification.storeIdentifier setting also set to hashed, ena
euvd.enisa.europa.eu
GitHub Advisory DatabasePackage advisoryGHSA-965c-763c-88jm
better-auth: OAuth state can be used as a Magic Link to sign in as another user
github.com
GitLab Advisory DatabasePackage advisoryCVE-2026-114607
Better Auth accepts an OAuth sign-in state value as a Magic Link token. An attacker can start an OAuth sign-in with any email address and use the returned state value to finish a Magic Link sign-in for that address. They never prove that they can read that email.
advisories.gitlab.com
Snyk Vulnerability DatabasePackage advisorySNYK-JS-BETTERAUTH-21460700
Improper Authentication
security.snyk.io

References

Freshness

Last verified in this catalog Nov 3, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

FIRST EPSSNov 3, 2026
GitLab Advisory DatabaseOct 28, 2026
GitHub Advisory DatabaseOct 27, 2026
Snyk Vulnerability DatabaseOct 25, 2026
CVE.orgOct 23, 2026
EUVDOct 22, 2026

Priority score

15/100

Evidence confidence: High

A vendor or government advisory agrees with at least one other source.

Confirmed exploitation0/30
EPSS probability1/20
CVSS severity14/15
Public exploit0/10
Internet exposure0/10
Product prevalence0/5
Detection0/5
Threat research0/5

Decision signals

Four separate signals — do not infer one from another.

Critical

CVSS severity
9.1 v3.1
Technical impact. Separate from exploitation likelihood.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS probability
0.42% · p35.98%
Estimated probability of exploitation within 30 days (FIRST).
Known exploitation
No verified KEV listing
Evidence from CISA KEV or VulnCheck KEV only — not from EPSS alone.
Patch availability
Version ranges on file
Affected version ranges suggest a fixed boundary. Verify against the vendor advisory for your release.

Stacks

npm

Weakness

CWE-287
Improper Authentication
MITRE definition

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